US4563532A - Process for the preparation of Δ4 -1,3,4-oxadiazolin-2-one compounds - Google Patents
Process for the preparation of Δ4 -1,3,4-oxadiazolin-2-one compounds Download PDFInfo
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- US4563532A US4563532A US06/556,715 US55671583A US4563532A US 4563532 A US4563532 A US 4563532A US 55671583 A US55671583 A US 55671583A US 4563532 A US4563532 A US 4563532A
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- 238000000034 method Methods 0.000 title abstract description 10
- 238000002360 preparation method Methods 0.000 title description 4
- 150000001875 compounds Chemical class 0.000 claims abstract description 37
- -1 heterocyclic radical Chemical class 0.000 claims abstract description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 13
- 239000001257 hydrogen Substances 0.000 claims abstract description 10
- 125000001424 substituent group Chemical group 0.000 claims abstract description 6
- 239000000460 chlorine Substances 0.000 claims description 11
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 10
- 229910052801 chlorine Inorganic materials 0.000 claims description 10
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 8
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 claims description 3
- 125000001731 2-cyanoethyl group Chemical group [H]C([H])(*)C([H])([H])C#N 0.000 claims description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims 3
- 125000000753 cycloalkyl group Chemical group 0.000 claims 1
- 239000002253 acid Substances 0.000 abstract description 9
- 150000007513 acids Chemical class 0.000 abstract description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 3
- 125000003710 aryl alkyl group Chemical group 0.000 abstract description 3
- 150000005840 aryl radicals Chemical class 0.000 abstract description 3
- 125000002837 carbocyclic group Chemical group 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 abstract description 2
- 125000000547 substituted alkyl group Chemical group 0.000 abstract description 2
- 101100386054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) CYS3 gene Proteins 0.000 abstract 1
- 101150035983 str1 gene Proteins 0.000 abstract 1
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 27
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 12
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- IANQTJSKSUMEQM-UHFFFAOYSA-N 1-benzofuran Chemical compound C1=CC=C2OC=CC2=C1 IANQTJSKSUMEQM-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 150000003254 radicals Chemical class 0.000 description 5
- 230000008707 rearrangement Effects 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 4
- 125000000217 alkyl group Chemical group 0.000 description 4
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 description 4
- 150000002431 hydrogen Chemical group 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- RFFLAFLAYFXFSW-UHFFFAOYSA-N 1,2-dichlorobenzene Chemical compound ClC1=CC=CC=C1Cl RFFLAFLAYFXFSW-UHFFFAOYSA-N 0.000 description 3
- FKASFBLJDCHBNZ-UHFFFAOYSA-N 1,3,4-oxadiazole Chemical compound C1=NN=CO1 FKASFBLJDCHBNZ-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- RWRDLPDLKQPQOW-UHFFFAOYSA-N Pyrrolidine Chemical compound C1CCNC1 RWRDLPDLKQPQOW-UHFFFAOYSA-N 0.000 description 3
- JFDZBHWFFUWGJE-UHFFFAOYSA-N benzonitrile Chemical compound N#CC1=CC=CC=C1 JFDZBHWFFUWGJE-UHFFFAOYSA-N 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 3
- 239000003495 polar organic solvent Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000002087 whitening effect Effects 0.000 description 3
- BBVIDBNAYOIXOE-UHFFFAOYSA-N 1,2,4-oxadiazole Chemical compound C=1N=CON=1 BBVIDBNAYOIXOE-UHFFFAOYSA-N 0.000 description 2
- BCMCBBGGLRIHSE-UHFFFAOYSA-N 1,3-benzoxazole Chemical compound C1=CC=C2OC=NC2=C1 BCMCBBGGLRIHSE-UHFFFAOYSA-N 0.000 description 2
- SNTWKPAKVQFCCF-UHFFFAOYSA-N 2,3-dihydro-1h-triazole Chemical compound N1NC=CN1 SNTWKPAKVQFCCF-UHFFFAOYSA-N 0.000 description 2
- NSPMIYGKQJPBQR-UHFFFAOYSA-N 4H-1,2,4-triazole Chemical compound C=1N=CNN=1 NSPMIYGKQJPBQR-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 2
- ZHNUHDYFZUAESO-UHFFFAOYSA-N Formamide Chemical compound NC=O ZHNUHDYFZUAESO-UHFFFAOYSA-N 0.000 description 2
- YNAVUWVOSKDBBP-UHFFFAOYSA-N Morpholine Chemical compound C1COCCN1 YNAVUWVOSKDBBP-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- NQRYJNQNLNOLGT-UHFFFAOYSA-N Piperidine Chemical compound C1CCNCC1 NQRYJNQNLNOLGT-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- IOJUPLGTWVMSFF-UHFFFAOYSA-N benzothiazole Chemical compound C1=CC=C2SC=NC2=C1 IOJUPLGTWVMSFF-UHFFFAOYSA-N 0.000 description 2
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
- 229910052794 bromium Inorganic materials 0.000 description 2
- 125000003917 carbamoyl group Chemical group [H]N([H])C(*)=O 0.000 description 2
- 125000004093 cyano group Chemical group *C#N 0.000 description 2
- 150000003948 formamides Chemical class 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 239000012454 non-polar solvent Substances 0.000 description 2
- 150000007530 organic bases Chemical group 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 description 2
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 2
- 239000008096 xylene Substances 0.000 description 2
- 125000004178 (C1-C4) alkyl group Chemical group 0.000 description 1
- MBIZXFATKUQOOA-UHFFFAOYSA-N 1,3,4-thiadiazole Chemical compound C1=NN=CS1 MBIZXFATKUQOOA-UHFFFAOYSA-N 0.000 description 1
- JIHQDMXYYFUGFV-UHFFFAOYSA-N 1,3,5-triazine Chemical compound C1=NC=NC=N1 JIHQDMXYYFUGFV-UHFFFAOYSA-N 0.000 description 1
- 150000000182 1,3,5-triazines Chemical class 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- OCJBOOLMMGQPQU-UHFFFAOYSA-N 1,4-dichlorobenzene Chemical compound ClC1=CC=C(Cl)C=C1 OCJBOOLMMGQPQU-UHFFFAOYSA-N 0.000 description 1
- ONQBOTKLCMXPOF-UHFFFAOYSA-N 1-ethylpyrrolidine Chemical compound CCN1CCCC1 ONQBOTKLCMXPOF-UHFFFAOYSA-N 0.000 description 1
- PAMIQIKDUOTOBW-UHFFFAOYSA-N 1-methylpiperidine Chemical group CN1CCCCC1 PAMIQIKDUOTOBW-UHFFFAOYSA-N 0.000 description 1
- HYZJCKYKOHLVJF-UHFFFAOYSA-N 1H-benzimidazole Chemical compound C1=CC=C2NC=NC2=C1 HYZJCKYKOHLVJF-UHFFFAOYSA-N 0.000 description 1
- VEUMBMHMMCOFAG-UHFFFAOYSA-N 2,3-dihydrooxadiazole Chemical compound N1NC=CO1 VEUMBMHMMCOFAG-UHFFFAOYSA-N 0.000 description 1
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 description 1
- GIECWRALKTXCRL-UHFFFAOYSA-N 2-[4-[2-[4-(2h-tetrazol-5-yl)phenyl]ethenyl]phenyl]-1,3-benzoxazole Chemical compound C=1C=C(C=2OC3=CC=CC=C3N=2)C=CC=1C=CC(C=C1)=CC=C1C1=NN=NN1 GIECWRALKTXCRL-UHFFFAOYSA-N 0.000 description 1
- YMQQWMACHGHOHI-UHFFFAOYSA-N 2-ethoxy-5-[2-(2-phenylethenyl)phenyl]-1,3,4-oxadiazole Chemical compound O1C(OCC)=NN=C1C1=CC=CC=C1C=CC1=CC=CC=C1 YMQQWMACHGHOHI-UHFFFAOYSA-N 0.000 description 1
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 1
- 229940093475 2-ethoxyethanol Drugs 0.000 description 1
- ZEOMRHKTIYBETG-UHFFFAOYSA-N 2-phenyl-1,3,4-oxadiazole Chemical compound O1C=NN=C1C1=CC=CC=C1 ZEOMRHKTIYBETG-UHFFFAOYSA-N 0.000 description 1
- YTZPUTADNGREHA-UHFFFAOYSA-N 2h-benzo[e]benzotriazole Chemical compound C1=CC2=CC=CC=C2C2=NNN=C21 YTZPUTADNGREHA-UHFFFAOYSA-N 0.000 description 1
- WZWIQYMTQZCSKI-UHFFFAOYSA-N 4-cyanobenzaldehyde Chemical compound O=CC1=CC=C(C#N)C=C1 WZWIQYMTQZCSKI-UHFFFAOYSA-N 0.000 description 1
- HVCNXQOWACZAFN-UHFFFAOYSA-N 4-ethylmorpholine Chemical compound CCN1CCOCC1 HVCNXQOWACZAFN-UHFFFAOYSA-N 0.000 description 1
- SNFAEUZNFIYGNA-UHFFFAOYSA-N 5-phenyl-1,2,4-oxadiazole Chemical compound C1=NOC(C=2C=CC=CC=2)=N1 SNFAEUZNFIYGNA-UHFFFAOYSA-N 0.000 description 1
- 101100177155 Arabidopsis thaliana HAC1 gene Proteins 0.000 description 1
- ZAFNJMIOTHYJRJ-UHFFFAOYSA-N Diisopropyl ether Chemical compound CC(C)OC(C)C ZAFNJMIOTHYJRJ-UHFFFAOYSA-N 0.000 description 1
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 1
- 206010056740 Genital discharge Diseases 0.000 description 1
- JLTDJTHDQAWBAV-UHFFFAOYSA-N N,N-dimethylaniline Chemical compound CN(C)C1=CC=CC=C1 JLTDJTHDQAWBAV-UHFFFAOYSA-N 0.000 description 1
- SVYKKECYCPFKGB-UHFFFAOYSA-N N,N-dimethylcyclohexylamine Chemical compound CN(C)C1CCCCC1 SVYKKECYCPFKGB-UHFFFAOYSA-N 0.000 description 1
- SJRJJKPEHAURKC-UHFFFAOYSA-N N-Methylmorpholine Chemical group CN1CCOCC1 SJRJJKPEHAURKC-UHFFFAOYSA-N 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- HTLZVHNRZJPSMI-UHFFFAOYSA-N N-ethylpiperidine Chemical compound CCN1CCCCC1 HTLZVHNRZJPSMI-UHFFFAOYSA-N 0.000 description 1
- 101100434170 Oryza sativa subsp. japonica ACR2.1 gene Proteins 0.000 description 1
- 101100434171 Oryza sativa subsp. japonica ACR2.2 gene Proteins 0.000 description 1
- ZCQWOFVYLHDMMC-UHFFFAOYSA-N Oxazole Chemical compound C1=COC=N1 ZCQWOFVYLHDMMC-UHFFFAOYSA-N 0.000 description 1
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 description 1
- CZPWVGJYEJSRLH-UHFFFAOYSA-N Pyrimidine Chemical compound C1=CN=CN=C1 CZPWVGJYEJSRLH-UHFFFAOYSA-N 0.000 description 1
- 101150108015 STR6 gene Proteins 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 description 1
- 235000005811 Viola adunca Nutrition 0.000 description 1
- 240000009038 Viola odorata Species 0.000 description 1
- 235000013487 Viola odorata Nutrition 0.000 description 1
- 235000002254 Viola papilionacea Nutrition 0.000 description 1
- 244000172533 Viola sororia Species 0.000 description 1
- 239000000370 acceptor Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000001540 azides Chemical class 0.000 description 1
- SRSXLGNVWSONIS-UHFFFAOYSA-N benzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-N 0.000 description 1
- WMUIZUWOEIQJEH-UHFFFAOYSA-N benzo[e][1,3]benzoxazole Chemical compound C1=CC=C2C(N=CO3)=C3C=CC2=C1 WMUIZUWOEIQJEH-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- AOGYCOYQMAVAFD-UHFFFAOYSA-N chlorocarbonic acid Chemical class OC(Cl)=O AOGYCOYQMAVAFD-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000012973 diazabicyclooctane Substances 0.000 description 1
- 229940117389 dichlorobenzene Drugs 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 229960001760 dimethyl sulfoxide Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002391 heterocyclic compounds Chemical class 0.000 description 1
- 229940042795 hydrazides for tuberculosis treatment Drugs 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000012442 inert solvent Substances 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 230000000269 nucleophilic effect Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- JWVCLYRUEFBMGU-UHFFFAOYSA-N quinazoline Chemical compound N1=CN=CC2=CC=CC=C21 JWVCLYRUEFBMGU-UHFFFAOYSA-N 0.000 description 1
- 125000001567 quinoxalinyl group Chemical class N1=C(C=NC2=CC=CC=C12)* 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 150000003536 tetrazoles Chemical class 0.000 description 1
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D271/00—Heterocyclic compounds containing five-membered rings having two nitrogen atoms and one oxygen atom as the only ring hetero atoms
- C07D271/02—Heterocyclic compounds containing five-membered rings having two nitrogen atoms and one oxygen atom as the only ring hetero atoms not condensed with other rings
- C07D271/10—1,3,4-Oxadiazoles; Hydrogenated 1,3,4-oxadiazoles
- C07D271/113—1,3,4-Oxadiazoles; Hydrogenated 1,3,4-oxadiazoles with oxygen, sulfur or nitrogen atoms, directly attached to ring carbon atoms, the nitrogen atoms not forming part of a nitro radical
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
- C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
- C07D413/10—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings linked by a carbon chain containing aromatic rings
Definitions
- the present invention relates to a new process for the preparation of compounds of the formula ##STR3## wherein Y denotes a carbocyclic or heterocyclic aromatic radical,
- R denotes hydrogen or R 1 ,
- R 1 denotes an optionally substituted alkyl, aralkyl or aryl radical
- n denotes 0 or 1
- the rings A and B can carry further non-chromophoric substituents.
- This heat-induced rearrangement proceeds surprisingly selectively, with migration of the radical R 1 from the oxygen to the adjacent, more nucleophilic nitrogen.
- non-chromophoric substituents optionally present in the compounds of the formula I are the conventional non-chromophoric substituents of brightener chemistry, that is to say, for example, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, phenyl, phenoxy or Cl.
- the rings A and B are preferably unsubstituted.
- Suitable aromatic carbocyclic radicals Y are aryl radicals as defined below in more detail.
- Suitable quasi-aromatic heterocyclic radicals Y are radicals of 5-membered or 6-membered mono-, di- or tri-nuclear heterocyclic compounds, such as, for example, those of the oxazole, imidazole, 1,2,4-oxadiazole, 1,3,4-oxadiazole, 1,3,4-thiadiazole, 1,2,3-, 1,2,4- and 1,3,4-triazole, pyrimidine, 1,3,5-triazine, benzoxazole, benzothiazole, benzimidazole, naphthoxazole, benzo-s-triazole, naphtho-s-triazole, benzo(b)-furan, quinazoline or quinoxaline series, which are linked with the remainder of the molecule in a conventional manner.
- Radicals from the benzoxazole, benzo(b)-furan, benzo-s-triazole, naphtho-s-triazole, 1,2,4- and 1,3,4-oxadiazole, 1,2,3-, 1,2,4- and 1,3,4-triazole and 1,3,5-triazine series are particularly preferred.
- Suitable non-chromophoric substituents are R, OH, CN, OR, COR, SO 2 R, NHCOR, CONH 2 , NHSO 2 R, OCOR, COOR, COOH, NHR', SO 3 H and the like.
- Alkyl is, in particular, C 1 -C 6 -alkyl, which can be substituted by hydroxyl, C 1 -C 4 -alkoxy, CN, carboxyl, C 1 -C 4 -alkoxycarbonyl, CONH 2 , chlorine or bromine, or trifluoromethyl.
- Aryl is, in particular, phenyl which is optionally substituted by C 1 -C 4 -alkyl, trifluoromethyl, chlorine, bromine, carboxyl, cyano, C 1 -C 4 -alkoxycarbonyl or C 1 -C 4 -alkoxy.
- Aralkyl is, in particular, phenyl-C 1 -C 4 -alkyl, which can be further substituted in the phenyl nucleus by chlorine, methyl or methoxy.
- Y represents a 1,2,4-oxadiazole, 1,3,4-oxadiazole or 1,2,3-triazole radical, a benzoxazole radical which is optionally substituted by 1 or 2 C 1 -C 4 -alkyl groups, C 1 -C 4 -alkoxy, 1 or 2 chlorine atoms, benzyl, phenyl, cyclohexyl, C 1 -C 4 -alkylsulphonyl or C 1 -C 4 -alkoxycarbonyl, or a benzo(b)-furan, benzo-s-triazole, naphtho-triazole, 5-phenyl-1,3,4-oxadiazole, 5-phenyl-1,2,4-oxadiazole or 3-phenyl-1,2,4-oxadiazole radical, R represents hydrogen, C 1 -C 6 -alkyl which is optionally substituted by C 1 -C 4 -alkoxy, hydroxyl, chlorine or cyano
- Y represents the radical of the formula ##STR8## and wherein n denotes 1,
- R 2 denotes hydrogen, C 1 -C 4 -alkyl, cyclohexyl, C 1 -C 4 -alkoxy, chlorine, benzyl, phenyl, C 1 -C 4 -alkoxycarbonyl or C 1 -C 4 -alkylsulphonyl,
- R 3 denotes hydrogen, C 1 -C 4 -alkyl, chlorine or C 1 -C 4 -alkoxy and
- R 4 denotes hydrogen, C 1 -C 4 -alkyl or chlorine, is particularly preferred.
- reaction of the tetrazole derivatives VII with the acid chlorides can be carried out in the temperature range from 0° to 120° C., preferably at 25°-90° C.
- the reaction is advantageously carried out in inert solvents, for example ethers, such as dioxane, tetrahydrofuran or diisopropyl ether, and furthermore in hydrocarbons, such as toluene, xylene, chlorobenzene or 1,2-dichlorobenzene, or in formamides, such as dimethylformamide, dimethylacetamide or dimethylsulphoxide, preferably in the presence of acid acceptors, in particular tertiary organic bases, such as triethylamine, pyridine, dimethylaniline or hexahydrodimethylaniline.
- inert solvents for example ethers, such as dioxane, tetrahydrofuran or diisopropyl ether, and furthermore in hydrocarbons, such as toluene, xylene, chlorobenzene or 1,2-dichlorobenzene, or in formamides, such as dimethylformamide, dimethylacetamide
- the rearrangement of the compounds V into the compounds I can be achieved merely by heating the substance to beyond its melting point.
- this reaction is advantageously carried out in the presence of a diluent, preferably a polar organic solvent, which is, needless to say, inert towards these substances.
- suitable acids are mineral acids, such as hydrochloric acid and sulphuric acid, and sulphonic acids, such as benzenesulphonic acid and p-toluenesulphonic acid.
- bases Either inorganic or organic compounds which are sufficiently soluble in the reaction mixture can be used as the bases.
- Preferred bases are organic bases, such as, for example, triethylamine, N-methyl- or N-ethyl-piperidine, piperidine, pyrrolidine, 1,4-diazabicyclo[2,2,2]octane (DABCO), morpholine, N-methyl- or N-ethyl-morpholine and N-ethylpyrrolidine, or the like.
- Suitable polar solvents are higher-boiling alcohols, such as n-butanol, tert.-butanol, glycol and diethylene glycol, glycol ethers, such as 2-methoxyethanol and 2-ethoxyethanol, nitriles, such as, for example, benzonitrile, and furthermore formamides, such as, for example, dimethylformamide, dimethylacetamide, N-methylpyrrolidone and phosphoric acid tris-dialkylamides, alkyl being, in particular, C 1 -C 4 -alkyl.
- Non-polar solvents which may be mentioned are toluene, xylene, chlorobenzene and dichlorobenzene.
- the reaction temperatures for the reaction according to the invention are between 100° and 250° C., preferably between 120° and 200° C.
- the present invention furthermore relates to new compounds of the formula I, that is to say compounds of the formula I which are not described in the abovementioned German Offenlegungsschrift No. 2,833,470, wherein
- R represents C 1 -C 4 -alkyl, C 2 -C 4 -chloroalkyl, C 2 -C 4 -hydroxyalkyl, cyanoethyl or C 1 -C 4 -alkoxy-C 2 -C 4 -alkyl.
- These brighteners which are particularly readily accessible by the new process, are distinguished by improved technological properties compared with the nearest comparable known brighteners, such as, for example, a superior brightening effect on polyester fibres.
- Y represents a benzoxazole radical, in particular a radical of the formula
- the substance gives brilliant whitening effects on PES in the exhaustion-high temperature process and the thermosol process.
- This substance also gives brilliant whitening effects on PES by the exhaustion-high temperature process and the thermosol process.
- the compound gives outstanding whitening effects with very good fastness properties on PES.
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- Chemical & Material Sciences (AREA)
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- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
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Abstract
Optical brighteners of the formula ##STR1## wherein Y denotes a carbocyclic or heterocyclic radical,
R denotes hydrogen or R1,
wherein
R1 is an optionally substituted alkyl, aralkyl or aryl radical, and
n denotes 0 or 1 and
the rings A and B can carry further substituents, are obtained in a simple manner by a process in which compounds of the formula ##STR2## are rearranged at elevated temperatures--if appropriate in the presence of acids.
Description
The present invention relates to a new process for the preparation of compounds of the formula ##STR3## wherein Y denotes a carbocyclic or heterocyclic aromatic radical,
R denotes hydrogen or R1,
R1 denotes an optionally substituted alkyl, aralkyl or aryl radical, and
n denotes 0 or 1 and
the rings A and B can carry further non-chromophoric substituents.
Some of the compounds of the formula I, which are useful optical brighteners, are known (compare German Offenlegungsschrift No. 2,833,470). According to this patent publication, these compounds are prepared either by reacting acid hydrazides of the formula ##STR4## with phosgene or chloroformates, or by condensing compounds of the formula ##STR5## with a compound of the formula ##STR6## wherein Z1 and Z2 are the conventional functional groups suitable for formation of --CH═CH-- bridges.
However, these processes have the disadvantages that they are not universally applicable (for example, compounds of the formula II in which R=alkyl cannot be prepared or can be prepared only with difficulty), or that the starting materials of the formulae III and IV can be obtained on an industrial scale only with a relatively high expenditure.
It has now been found that the compounds of the formula I can be prepared in a simple and economical manner by a process in which compounds of the formula ##STR7## are rearranged at temperatures of 100°-250° C.--if appropriate in the presence of acids.
This heat-induced rearrangement proceeds surprisingly selectively, with migration of the radical R1 from the oxygen to the adjacent, more nucleophilic nitrogen.
The non-chromophoric substituents optionally present in the compounds of the formula I are the conventional non-chromophoric substituents of brightener chemistry, that is to say, for example, C1 -C4 -alkyl, C1 -C4 -alkoxy, phenyl, phenoxy or Cl. However, the rings A and B are preferably unsubstituted.
Suitable aromatic carbocyclic radicals Y are aryl radicals as defined below in more detail.
Suitable quasi-aromatic heterocyclic radicals Y are radicals of 5-membered or 6-membered mono-, di- or tri-nuclear heterocyclic compounds, such as, for example, those of the oxazole, imidazole, 1,2,4-oxadiazole, 1,3,4-oxadiazole, 1,3,4-thiadiazole, 1,2,3-, 1,2,4- and 1,3,4-triazole, pyrimidine, 1,3,5-triazine, benzoxazole, benzothiazole, benzimidazole, naphthoxazole, benzo-s-triazole, naphtho-s-triazole, benzo(b)-furan, quinazoline or quinoxaline series, which are linked with the remainder of the molecule in a conventional manner.
Radicals from the benzoxazole, benzo(b)-furan, benzo-s-triazole, naphtho-s-triazole, 1,2,4- and 1,3,4-oxadiazole, 1,2,3-, 1,2,4- and 1,3,4-triazole and 1,3,5-triazine series are particularly preferred.
Suitable non-chromophoric substituents are R, OH, CN, OR, COR, SO2 R, NHCOR, CONH2, NHSO2 R, OCOR, COOR, COOH, NHR', SO3 H and the like.
Alkyl is, in particular, C1 -C6 -alkyl, which can be substituted by hydroxyl, C1 -C4 -alkoxy, CN, carboxyl, C1 -C4 -alkoxycarbonyl, CONH2, chlorine or bromine, or trifluoromethyl.
Aryl is, in particular, phenyl which is optionally substituted by C1 -C4 -alkyl, trifluoromethyl, chlorine, bromine, carboxyl, cyano, C1 -C4 -alkoxycarbonyl or C1 -C4 -alkoxy.
Aralkyl is, in particular, phenyl-C1 -C4 -alkyl, which can be further substituted in the phenyl nucleus by chlorine, methyl or methoxy.
The preparation of compounds of the formula I wherein
Y represents a 1,2,4-oxadiazole, 1,3,4-oxadiazole or 1,2,3-triazole radical, a benzoxazole radical which is optionally substituted by 1 or 2 C1 -C4 -alkyl groups, C1 -C4 -alkoxy, 1 or 2 chlorine atoms, benzyl, phenyl, cyclohexyl, C1 -C4 -alkylsulphonyl or C1 -C4 -alkoxycarbonyl, or a benzo(b)-furan, benzo-s-triazole, naphtho-triazole, 5-phenyl-1,3,4-oxadiazole, 5-phenyl-1,2,4-oxadiazole or 3-phenyl-1,2,4-oxadiazole radical, R represents hydrogen, C1 -C6 -alkyl which is optionally substituted by C1 -C4 -alkoxy, hydroxyl, chlorine or cyano, or phenyl and n denotes 1,
is preferred.
The preparation of compounds of the formula I wherein
Y represents the radical of the formula ##STR8## and wherein n denotes 1,
R2 denotes hydrogen, C1 -C4 -alkyl, cyclohexyl, C1 -C4 -alkoxy, chlorine, benzyl, phenyl, C1 -C4 -alkoxycarbonyl or C1 -C4 -alkylsulphonyl,
R3 denotes hydrogen, C1 -C4 -alkyl, chlorine or C1 -C4 -alkoxy and
R4 denotes hydrogen, C1 -C4 -alkyl or chlorine, is particularly preferred.
The compounds of the formula V required as starting materials for the rearrangement according to the invention have not yet been described in the literature.
However, these compounds are easily obtained by reacting compounds of the formula ##STR9## with metal azides in polar organic solvents to give compounds of the formula ##STR10## and treating these with compounds of the formula ##STR11##
Only some of the compounds of the formula VI are known. They are obtained in a conventional manner, for example by reacting compounds of the formula ##STR12## wherein Z represents a grouping of the formula ##STR13## wherein R denotes C1 -C4 -alkyl, cyclohexyl or phenyl, with p-cyanobenzaldehyde (compare German Offenlegungsschrift No. 2,453,355, German Auslegeschrift No. 1,052,405 and Japanese Preliminary Published Application No. 49/85,378).
The reaction of the tetrazole derivatives VII with the acid chlorides can be carried out in the temperature range from 0° to 120° C., preferably at 25°-90° C.
The reaction is advantageously carried out in inert solvents, for example ethers, such as dioxane, tetrahydrofuran or diisopropyl ether, and furthermore in hydrocarbons, such as toluene, xylene, chlorobenzene or 1,2-dichlorobenzene, or in formamides, such as dimethylformamide, dimethylacetamide or dimethylsulphoxide, preferably in the presence of acid acceptors, in particular tertiary organic bases, such as triethylamine, pyridine, dimethylaniline or hexahydrodimethylaniline.
The rearrangement of the compounds V into the compounds I can be achieved merely by heating the substance to beyond its melting point. However, this reaction is advantageously carried out in the presence of a diluent, preferably a polar organic solvent, which is, needless to say, inert towards these substances.
Compounds of the formula I in which R1 denotes hydrogen are prepared by reacting compounds of the formula V in which R1 denotes alkyl with acids in polar organic solvents.
Examples of suitable acids are mineral acids, such as hydrochloric acid and sulphuric acid, and sulphonic acids, such as benzenesulphonic acid and p-toluenesulphonic acid.
The rearrangement can, however, also be carried out in non-polar solvents. Nevertheless, it is then advisable to add bases. Either inorganic or organic compounds which are sufficiently soluble in the reaction mixture can be used as the bases. Preferred bases are organic bases, such as, for example, triethylamine, N-methyl- or N-ethyl-piperidine, piperidine, pyrrolidine, 1,4-diazabicyclo[2,2,2]octane (DABCO), morpholine, N-methyl- or N-ethyl-morpholine and N-ethylpyrrolidine, or the like.
Suitable polar solvents are higher-boiling alcohols, such as n-butanol, tert.-butanol, glycol and diethylene glycol, glycol ethers, such as 2-methoxyethanol and 2-ethoxyethanol, nitriles, such as, for example, benzonitrile, and furthermore formamides, such as, for example, dimethylformamide, dimethylacetamide, N-methylpyrrolidone and phosphoric acid tris-dialkylamides, alkyl being, in particular, C1 -C4 -alkyl.
Non-polar solvents which may be mentioned are toluene, xylene, chlorobenzene and dichlorobenzene. The reaction temperatures for the reaction according to the invention are between 100° and 250° C., preferably between 120° and 200° C.
The present invention furthermore relates to new compounds of the formula I, that is to say compounds of the formula I which are not described in the abovementioned German Offenlegungsschrift No. 2,833,470, wherein
R represents C1 -C4 -alkyl, C2 -C4 -chloroalkyl, C2 -C4 -hydroxyalkyl, cyanoethyl or C1 -C4 -alkoxy-C2 -C4 -alkyl.
These brighteners, which are particularly readily accessible by the new process, are distinguished by improved technological properties compared with the nearest comparable known brighteners, such as, for example, a superior brightening effect on polyester fibres.
Particularly preferred compounds of the formula I are those in which
R has the abovementioned meaning and
Y represents a benzoxazole radical, in particular a radical of the formula
20.5 g (0.05 mol) of 5-ethoxy-1,3,4-oxadiazol-2-yl-stilbene of the formula ##STR15## are refluxed in 200 ml of dimethylformamide for 3 hours. After the mixture has been cooled to room temperature, the precipitated product is filtered off, washed with water and methanol and dried at 70° C. in vacuo. 18.5 g (90.4% of theory) of the compound of the formula ##STR16## are obtained, and can be recrystallised from dimethylacetamide. Melting point: 284°-85° C.; (absorption: λmax=366 nm; IR: νC═O =1777 cm-1).
______________________________________ C.sub.25 H.sub.19 N.sub.3 O.sub.3 (409.5) C % H % N % ______________________________________ calculated 73.3 4.68 10.26 found 72.8 4.6 10.0 ______________________________________
The substance gives brilliant whitening effects on PES in the exhaustion-high temperature process and the thermosol process.
5.2 g (0.055 mol) of dimethylchlorocarbonate are added to a suspension of 18.3 g (0.05 mol) of 4-(benzoxazol-2-yl)-4'-(1,2,3,4-tetrazol-5-yl)-stilbene (formula 3) ##STR17## and 5.6 g (0.05 mol) of triethylamine in 200 ml of dimethylacetamide at room temperature. The mixture is then stirred at room temperature for 30 minutes and at 70° C. for 1 hour. The compound of the formula ##STR18## is thereby formed, and is not isolated.
A further 5.5 g of triethylamine are added to the mixture, which is then stirred at 130°-140° C. for 2 hours. After cooling to 20° C., the precipitate is filtered off, washed with water and methanol and dried in vacuo. 15.2 g (76.9% of theory) of light yellow crystals of the compound of the formula ##STR19## are thus obtained, and can be recrystallised from dimethylformamide. Melting point: 271°-73° C., (absorption: λmax=360 nm; IR: νCO =1776 cm-1). C24 H17 N3 O3, mass: m/e 395 (63%) M+.
This substance also gives brilliant whitening effects on PES by the exhaustion-high temperature process and the thermosol process.
Analogously to Example 1, rearrangement of 23 g (0.05 mol) of the compound of the formula ##STR20## in dimethylformamide gives 17.3 g (75.2% of theory) of a yellow crystalline powder of the compound of the formula ##STR21## which can be dissolved in and crystallised from dimethylformamide. Melting point: 270°-75° C., (absorption: λmax=376 nm, IR: νCO =1775 cm-1).
______________________________________ C.sub.28 H.sub.21 N.sub.5 O.sub.2 (459.5) C % H % N % ______________________________________ calculated: 73.2 4.61 15.24 found: 72.9 4.7 15.5 ______________________________________
In the same manner as described in Example 1, 22.3 g (0.05 mol) of the methyl derivative (OCH3 instead of OC2 H5) of the formula (6) give 21.6 g (96.7% of theory) of light yellow crystals of the formula ##STR22## which can be recrystallised from dimethylformamide. Melting point: 274°-76° C., (absorption: λmax=376 nm, IR: νCO =1776 cm-1).
______________________________________ C.sub.27 H.sub.19 N.sub.5 O.sub.2 C % H % N % ______________________________________ calculated: 72.8 4.3 15.72 found: 72.2 4.4 15.9 ______________________________________
The compound gives outstanding whitening effects with very good fastness properties on PES.
The following compounds are prepared in a manner analogous to that described in Examples 1-4:
______________________________________ ##STR23## (9) Fluores- cence in dimethyl- No. Y Q formamide ______________________________________ 9. ##STR24## CH.sub.3 greenish- tinged violet 10. ##STR25## C.sub.3 H.sub.7n reddish- tinged blue ##STR26## CH.sub.3 neutral blue ##STR27## C.sub.4 H.sub.9n blue- violet ##STR28## CH.sub.3 neutral blue ##STR29## CH.sub.2 CH.sub.2 neutral blue ##STR30## CH.sub.2 reddish- tinged blue ##STR31## CH.sub.2 CH.sub.2 OCH.sub.3 blue ##STR32## C.sub.2 H.sub.5 reddish- tinged blue ##STR33## CH.sub.3 neutral blue ##STR34## C.sub.4 H.sub.9n greenish tinged blue ______________________________________
50 g of concentrated hydrochloric acid are added dropwise to a suspension of 12.3 g (0.03 mol) of the compound of the formula (1) in 300 ml of dimethylformamide such that a temperature of 25°-30° C. is maintained. The mixture is stirred at 30° C. for 30 minutes and at 60° C. for 3 hours. It is then cooled to room temperature. The product is filtered off and washed with water and methanol. 7.8 g (68.2% of theory) of the compound of the formula ##STR35## are obtained in the form of light yellow crystals, which can be recrystallised from dimethylformamide. Melting point: >300° C., (absorption: λmax=366 nm, IR: νCO =1764 cm-1). C23 H15 N3 O3 (381.4), mass: m/e 381 (85%) M+.
Claims (2)
1. A compound of the formula ##STR36## in which the rings A and B can carry further non-chromophoric substituents,
R is C1 -C4 -alkyl, C2 -C4 -chloroalkyl, C2 -C4 -hydroxyalkyl, cyanoethyl or C1 -C4 -methoxy-C2 -C4 -alkyl,
R2 is hydrogen, C1 -C4 -alkyl, cycloalkyl, C1 -C4 -alkoxy, chlorine, benzyl, phenyl, C1 -C4 -alkoxycarbonyl or C1 -C4 -alkylsulphonyl,
R3 is hydrogen, C1 -C4 -alkyl, chlorine or C1 -C4 -alkoxy, and
R4 is hydrogen, C1 -C4 -alkyl or chlorine.
2. A compound according to claim 1 of the formula ##STR37##
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE3245202 | 1982-12-07 | ||
DE19823245202 DE3245202A1 (en) | 1982-12-07 | 1982-12-07 | METHOD FOR PRODUCING (ARROW UP) (DELTA) (ARROW UP) (ARROW UP) 4 (ARROW UP) -1,3,4-OXADIAZOLINE- (2) -ON COMPOUNDS |
Publications (1)
Publication Number | Publication Date |
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US4563532A true US4563532A (en) | 1986-01-07 |
Family
ID=6179994
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US06/556,715 Expired - Fee Related US4563532A (en) | 1982-12-07 | 1983-11-30 | Process for the preparation of Δ4 -1,3,4-oxadiazolin-2-one compounds |
Country Status (4)
Country | Link |
---|---|
US (1) | US4563532A (en) |
JP (1) | JPS59112977A (en) |
CH (1) | CH659071A5 (en) |
DE (1) | DE3245202A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US4246403A (en) * | 1978-07-29 | 1981-01-20 | Hoechst Aktiengesellschaft | 1,3,4-Oxadiazolone-(2) compounds and process for their manufacture |
-
1982
- 1982-12-07 DE DE19823245202 patent/DE3245202A1/en not_active Withdrawn
-
1983
- 1983-11-30 US US06/556,715 patent/US4563532A/en not_active Expired - Fee Related
- 1983-12-02 JP JP58227091A patent/JPS59112977A/en active Pending
- 1983-12-06 CH CH6554/83A patent/CH659071A5/en not_active IP Right Cessation
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US4246403A (en) * | 1978-07-29 | 1981-01-20 | Hoechst Aktiengesellschaft | 1,3,4-Oxadiazolone-(2) compounds and process for their manufacture |
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JPS59112977A (en) | 1984-06-29 |
DE3245202A1 (en) | 1984-06-07 |
CH659071A5 (en) | 1986-12-31 |
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